[1] Univ Bergen, Dept Global Publ Hlth & Primary Care, Pb 7804, N-5020 Bergen, Norway
[2] Haukeland Hosp, Surg Clin, Norwegian Qual Registry Cleft Lip & Palate, Bergen, Norway
[3] Norwegian Inst Publ Hlth, Div Mental & Phys Hlth, Bergen, Norway
[4] Karolinska Inst, Dept Med Solna, Clin Epidemiol Div, Stockholm, Sweden
[5] Finnish Inst Hlth & Welf, Dept Knowledge Brokers, Helsinki, Finland
[6] Acad Primary Hlth Care Ctr, Stockholm, Sweden
[7] Karolinska Inst, Dept Mol Med & Surg, Stockholm, Sweden
[8] Uppsala Univ, Dept Immunol Genet & Pathol, Uppsala, Sweden
[9] Canc Registry Norway, Oslo, Norway
[10] Finnish Canc Registry, Canc Soc Finland, Helsinki, Finland
[11] Dana Farber Canc Inst, Boston Childrens Canc & Blood Disorders Ctr, Boston, MA 02115 USA
[12] Aarhus Univ Hosp, Dept Clin Epidemiol, Aarhus, Denmark
[13] Aarhus Univ, Aarhus, Denmark
[14] NCI, Transdiv Res Program, Div Canc Epidemiol & Genet, Rockville, MD USA